931981127621 has 2 divisors, whose sum is σ = 931981127622. Its totient is φ = 931981127620.

The previous prime is 931981127563. The next prime is 931981127669. The reversal of 931981127621 is 126721189139.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 916873276225 + 15107851396 = 957535^2 + 122914^2 .

It is a cyclic number.

It is not a de Polignac number, because 931981127621 - 2¹⁸ = 931980865477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 931981127621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (931981120621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 465990563810 + 465990563811.

It is an arithmetic number, because the mean of its divisors is an integer number (465990563811).

Almost surely, 2^931981127621 is an apocalyptic number.

It is an amenable number.

931981127621 is a deficient number, since it is larger than the sum of its proper divisors (1).

931981127621 is an equidigital number, since it uses as much as digits as its factorization.

931981127621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 50.

The spelling of 931981127621 in words is "nine hundred thirty-one billion, nine hundred eighty-one million, one hundred twenty-seven thousand, six hundred twenty-one".